| 摘要 |
<p>A first member (10) is provided comprising a surface (11) the front portion of which is flat and is arranged to make contact with a major face of the blade; a second member (20) comprises a surface (21) facing the surface (11); means (30) are provided to retain the two members (10) and (20) together to prevent the facing surfaces (11) and (21) moving apart, said means (30) being provided in the intermediate region of the surfaces (11) and (21) and being insertable arid withdrawable by moving the two members (10) and (20) relative to each other in a direction parallel to the surfaces (11) and (21); finally, cam means (40) are provided able to exert a thrust tending to move the facing surfaces (11) and (21) apart in a direction perpendicular to these latter, said means (40) being provided in the rear region of the facing surfaces (11) and (21). <IMAGE></p> |
